RU2535854C1 - Filling mixture compound - Google Patents

Abstract

FIELD: mining.

SUBSTANCE: filling mixture compound including a binding agent, an inert filler and water, where the binding agent and the inert filler are made from ore benefication wastes, with a fraction size of not more than 20 mm, one part of which is subject to dry activation by preliminary agitation leaching, separation of a liquid phase, drying and activation in a disintegrator, and the other part is mixed with a leaching solution; the obtained pulp is activated in the disintegrator; the liquid phase is separated; a deposit is dried and a dry mixture of the compound is prepared, wt %: a binding agent - the specified product of dry activation 42, inert filler - the specified deposit 58; after that, water is added in terms of 280-290 l per 1 m³ of dry mixture; rotation speed of a working element of the disintegrator is at least 200 Hz.

EFFECT: achievement of sufficient strength at reduction of content of metals and cost.

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Description

The invention relates to the mining industry and can be used in the development of mineral deposits underground method with the laying of the developed space.

A number of compositions of filling mixtures are known, in which industrial waste is used as a binder - ground blast furnace slag, and burned rocks, tailings as an inert filler. For example, patent No. 2396435 (RU No. 23964350, publ. 08/10/2010. Bull. No. 22) or patent No. 2425980 (RU No. 2425980 C1, publ. 10.08.2011. Bull. No. 22). A common drawback of such solutions is the significant amount of slag used (up to 20% by weight) and, as a consequence, the need for metallurgical production at a small distance from the mining site, as well as a high residual metal content in the aggregate.

Closest to the proposed invention is the composition of the filling mixture according to patent No. 2422640 (RU No. 2422640 C1, publ. 06/27/2011. Bull. No. 18), including Portland cement, aggregate and water. The composition contains wet magnetic separation waste with a specific surface of 80 m ² / kg, Portland cement M 400, crushed in a disintegrator together with the waste of wet magnetic separation of ferruginous quartzite (MMS) to form a composite binder with a specific surface of 500 m ² / kg as a filler. The disadvantages of the prototype is the use of expensive Portland cement and a high residual content in the laying of metals, which is unacceptable from the point of view of resource conservation and environmental safety.

The objective of the invention is to eliminate the disadvantages of analogues and prototype.

The technical result is to achieve the strength of the array based on the proposed mixture, sufficient to maintain the worked out space in favorable conditions and when using multi-strength bookmarks. In addition, it provides a decrease in the content in the filling mixture of metals and a decrease in its cost by eliminating expensive components.

The technical result is achieved by the composition of the filling mixture, including astringent, inert aggregate and water. An astringent and inert aggregate is made from ore dressing waste subjected to mechanochemical treatment using various technologies. Prepared for processing ore dressing waste, fractions of not more than 20 mm, one part of which is intended to produce a binder, is subjected to preliminary agitation leaching with a solution containing sulfuric acid (10 g / l) and sodium chloride (160 g / l), in a ratio of 1 : 4, the liquid phase is separated, dried and activated in the disintegrator, and the other part, intended to obtain an inert aggregate, is mixed with the leaching solution, the resulting pulp is activated in the disintegrator, the liquid phase is separated with the metals transferred into it s, the precipitate is dried and prepared dry mixture composition, wt.%: binder - said dry activation product 42, an inert filler - said precipitate 58, after which water is added at the rate of 280-290 liters per 1 m ³ of dry mix. The frequency of rotation of the working body of the disintegrator is at least 200 Hz.

Leaching of the material in the form of pulp simultaneously with activation in the disintegrator makes it possible to increase the efficiency of metal extraction up to 90-95% of their initial content in a time that is 1-2 orders of magnitude lower than with agitation leaching. But the astringent effect of the waste activated in this way is negligible, therefore, some of the waste is subjected to preliminary agitation leaching before activation.

Example

The filling mixture is prepared as follows.

A fraction larger than 20 mm is removed by sifting from polymetallic or iron ore dressing wastes prepared for processing. The remaining material is divided into two parts. One part to obtain a binder is subjected to agitation leaching for 30 minutes with an aqueous solution containing sulfuric acid (10 g / l) and sodium chloride (160 g / l). Next, a solid phase is isolated from the pulp using a filter press. When the moisture content in the selected solid phase is more than 1% by mass, it is dried in an oven at a temperature of 100-105 ° C to a moisture content of not more than 1% by mass. The liquid component separated in the filter press is sent for processing to recover the metals transferred into it. The resulting solid phase with a moisture content of not more than 1% is passed through the working chamber of the disintegrator. The frequency of rotation of the working body of the disintegrator should be at least 200 Hz (12000 min ^-1 ). With this processing intensity, with a particle size of up to 2 mm supplied to the disintegrator, at least 80% of the particles have a diameter of less than 100 microns at the outlet. When using DESI 11 type disintegrator plants, dry-activated waste is passed through the working chamber once, when using cyclic disintegrators, the required activation time is established experimentally by the criterion - particle size at the outlet (at least 80% of the particles must have a diameter of less than 100 microns) . The second part to obtain an inert filler is mixed with a leach solution, after which the resulting pulp is also activated in the disintegrator, passing it through the working chamber at least once. The leach solution is prepared on an aqueous basis by the addition of sulfuric acid (10 g / l) and sodium chloride (160 g / l). The amount of leach solution is selected from a ratio of 1 (waste): 4 (leach solution) by weight. The rotational speed of the working body of the disintegrator must be at least 200 Hz (12000 min ^-1 ), no requirements are made to the size of the particles of the solid phase at the output. Next, a solid phase is isolated from the pulp using a filter press. When the moisture content in the selected solid phase is more than 3% by mass, it is dried in an oven at a temperature of 100-105 ° C to a moisture content of not more than 3% by mass. The liquid component separated in the filter - press is sent for processing to recover the metals transferred into it.

Activated enrichment waste is fed to the mixer in the ratio (wt.%):

- binder in the form of activated dry waste enrichment - 42%,

- inert filler in the form of activated waste pulp in the form of pulp - 58%,

then add water at the rate of 280-290 liters per 1 m ³ dry mix. The resulting filling material is transported to the place of installation through pipelines. The strength of the array obtained on the basis of the proposed mixture does not exceed 1.3-2 MPa, which is sufficient to maintain the worked out space in favorable conditions and when using multi-strength bookmarks.

Thus, the task is solved.

Claims (1)

The composition of the filling mixture, including a binder, inert filler and water, characterized in that the binder and inert filler is made from ore dressing waste, fractions of not more than 20 mm, one part of which is subjected to dry activation by preliminary agitation leaching, separation of the liquid phase, drying and activation in the disintegrator, and the other part is mixed with a leach solution, the resulting pulp is activated in the disintegrator, the liquid phase is separated, the precipitate is dried and a dry mixture of the composition is prepared, wt.%: knit it - said dry activation product 42, an inert filler - said precipitate 58, after which water is added at the rate of 280-290 liters per 1 m ³ of dry mixture, wherein the working body speed disintegrator at least 200 Hz.